Libertarians always line-up with 'Liberals' on the hot button moral issues of the day - but present themselves as tough-minded rationalists about the economy, defense, federalism and the like.
In other words, Libertarians claim to be more effective and efficient Leftists: the have exactly the same 'ultimate' utilitarian aims in life, but claim to be better at reaching them.
And this is why libertarianism is merely a hobby for a tiny minority of dissociated smart lads - because to be a Libertarian entails having a dual personality as regards ends and means: one part of the mind entranced by the vague, unbounded dreams of Leftism; while the other part operates like a hard-eyed manipulative Machiavellian.
Libertarians are fundamentally Leftist, hence fundamentally irrational; and Libertarians are superficially rationalist, hence anti-Left.
Libertarians imagines this combination means they have straddled and integrated Left and Right - but this is crude contradiction: incoherence, not synthesis.
Sadly, this criticism also applies to the secular Right in general: utilitarianism just is Leftism, their rationalism fights their Leftism; their secularism propels them into Leftism.
So there are only two side - the Religious Right and the anti-Religious Right (i.e. the Left). Everything else is incoherent, self-fighting, self-defeating.